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How to plan the “airtight layer”

The heat transferring surface of the building must be implemented with a permanent seal. For airtightness in passive houses, the minimum requirement is an ACH₅₀ of at most 0.6 per hour. This means that at a pressure differential of 50 pascal only 60 percent of the air inside a building may be exchanged per hour.

Continuous airtight layer in a building (source: Schulze Darup)